1100012021220 has 96 divisors (see below), whose sum is σ = 3520398486528. Its totient is φ = 251405603712.

The previous prime is 1100012021197. The next prime is 1100012021221. The reversal of 1100012021220 is 221202100011.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1100012021196 and 1100012021205.

It is not an unprimeable number, because it can be changed into a prime (1100012021221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4139607 + ... + 4397313.

It is an arithmetic number, because the mean of its divisors is an integer number (36670817568).

Almost surely, 2^{1100012021220} is an apocalyptic number.

1100012021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100012021220 is an abundant number, since it is smaller than the sum of its proper divisors (2420386465308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1100012021220 is a wasteful number, since it uses less digits than its factorization.

1100012021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267889 (or 267887 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1100012021220 its reverse (221202100011), we get a palindrome (1321214121231).

The spelling of 1100012021220 in words is "one trillion, one hundred billion, twelve million, twenty-one thousand, two hundred twenty".